Power failure warning light



FIG. 1 is a top perspective view of a power failure warning light of the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a third side view thereof; and,

FIG. 7 is a fourth side view threreof. 

We claim the ornamental design for a power failure warning light, as shown and described. 